reflective vs unthinking

reflective

adj
  • Involving reflection. 

  • Reciprocal. 

  • That reveals or shows; revealing; indicative of. 

  • That reflects, or redirects back to the source. 

  • Pondering, especially thinking back on the past. 

unthinking

adj
  • Showing no regard; careless or unconcerned. 

  • Without proper thought; thoughtless. 

How often have the words reflective and unthinking occurred in a corpus of books? (source: Google Ngram Viewer )